title: Serum 25-hydroxy vitamin D in surface and underground coalminers.
mesh_terms: D015652:25-Hydroxyvitamin D 2; D000328:Adult; D003032:Coal Mining; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009787:Occupational Medicine; D013472:Sunlight; D013997:Time Factors
chemical_list: D006887:Hydroxycholecalciferols; D015652:25-Hydroxyvitamin D 2